Really having fun with this. Was looking into designing a similar thing when I saw this mod.
Hope development for this will continue.

Things to consider, mostly regarding starting on new planets - a feature I hope you'll expand on:

• When doing the Vulcanus start (or presumably, any start on another planet), building the space station will be challenging as asteroids destroy it fast. Is this something that needs to be modded too? So that your starting planet is the safe one?
• I wonder if alternative planet starts can lead to softlocks...
• When starting on another planet, the milestones might be out of order when achieving them. Could it be an idea to change the value of the milestone rewards when starting on alternative planets.
• Could this be made compatible with other mods that add more planets?